src/ext4_trans.c

   1 /*
   2  * Copyright (c) 2015 Grzegorz Kostka (kostka.grzegorz@gmail.com)
   3  * Copyright (c) 2015 Kaho Ng (ngkaho1234@gmail.com)
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * - Redistributions of source code must retain the above copyright
  11  *   notice, this list of conditions and the following disclaimer.
  12  * - Redistributions in binary form must reproduce the above copyright
  13  *   notice, this list of conditions and the following disclaimer in the
  14  *   documentation and/or other materials provided with the distribution.
  15  * - The name of the author may not be used to endorse or promote products
  16  *   derived from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 /** @addtogroup lwext4
  31  * @{
  32  */
  33 /**
  34  * @file  ext4_trans.c
  35  * @brief Ext4 transaction buffer operations.
  36  */
  37
  38 #include "ext4_config.h"
  39 #include "ext4_types.h"
  40 #include "ext4_misc.h"
  41 #include "ext4_errno.h"
  42 #include "ext4_debug.h"
  43
  44 #include "ext4_fs.h"
  45 #include "ext4_journal.h"
  46
  47 static int ext4_trans_get_write_access(struct ext4_fs *fs __unused,
  48                                 struct ext4_block *block __unused)
  49 {
  50         int r = EOK;
  51 #if CONFIG_JOURNALING_ENABLE
  52         if (fs->jbd_journal && fs->curr_trans) {
  53                 struct jbd_journal *journal = fs->jbd_journal;
  54                 struct jbd_trans *trans = fs->curr_trans;
  55                 r = jbd_trans_get_access(journal, trans, block);
  56         }
  57 #endif
  58         return r;
  59 }
  60
  61 int ext4_trans_set_block_dirty(struct ext4_buf *buf)
  62 {
  63         int r = EOK;
  64 #if CONFIG_JOURNALING_ENABLE
  65         struct ext4_fs *fs = buf->bc->bdev->fs;
  66         struct ext4_block block = {
  67                 .lb_id = buf->lba,
  68                 .data = buf->data,
  69                 .buf = buf
  70         };
  71
  72         if (fs->jbd_journal && fs->curr_trans) {
  73                 struct jbd_trans *trans = fs->curr_trans;
  74                 return jbd_trans_set_block_dirty(trans, &block);
  75         }
  76 #endif
  77         ext4_bcache_set_dirty(buf);
  78         return r;
  79 }
  80
  81 int ext4_trans_block_get_noread(struct ext4_blockdev *bdev,
  82                           struct ext4_block *b,
  83                           uint64_t lba)
  84 {
  85         int r = ext4_block_get_noread(bdev, b, lba);
  86         if (r != EOK)
  87                 return r;
  88
  89         r = ext4_trans_get_write_access(bdev->fs, b);
  90         if (r != EOK)
  91                 ext4_block_set(bdev, b);
  92
  93         return r;
  94 }
  95
  96 int ext4_trans_block_get(struct ext4_blockdev *bdev,
  97                    struct ext4_block *b,
  98                    uint64_t lba)
  99 {
 100         int r = ext4_block_get(bdev, b, lba);
 101         if (r != EOK)
 102                 return r;
 103
 104         r = ext4_trans_get_write_access(bdev->fs, b);
 105         if (r != EOK)
 106                 ext4_block_set(bdev, b);
 107
 108         return r;
 109 }
 110
 111 int ext4_trans_try_revoke_block(struct ext4_blockdev *bdev __unused,
 112                                 uint64_t lba __unused)
 113 {
 114         int r = EOK;
 115 #if CONFIG_JOURNALING_ENABLE
 116         struct ext4_fs *fs = bdev->fs;
 117         if (fs->jbd_journal && fs->curr_trans) {
 118                 struct jbd_trans *trans = fs->curr_trans;
 119                 r = jbd_trans_try_revoke_block(trans, lba);
 120         } else if (fs->jbd_journal) {
 121                 r = ext4_block_flush_lba(fs->bdev, lba);
 122         }
 123 #endif
 124         return r;
 125 }
 126
 127 /**
 128  * @}
 129  */